Malicious PDF — malware analysis report

Static analysis result for SHA-256 31186b1c301cfca9…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 05:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c22361b39d7342b025c3586893009986 SHA-1: 9d96db7d9041b34d8d6542191ebf071a4bd00306 SHA-256: 31186b1c301cfca98e6d3a0dd5a00c91f718674f73bf25918855504bb5a935d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload. It functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f36d1bcce6e0930204591e81b4eb8085/milizesuvis.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87a46cd4e---16648818132.pdf
    • http://gptools.net/userfiles/file/vuteduwazuf.pdf
    • http://ketoanaca.com/uploads/image/files/66689160220.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7b9ae7b0---vapitipatakapudareg.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e534bae28---71599197683.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/46543558243.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795eefac989---62783402320.pdf
    • http://jinohair.com/upload/files/80683609092.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5ca1f245---nogidonapa.pdf
    • http://thuexedanang247.com/uploads/image/files/37368614245.pdf
    • https://cengilli.com/icerik_images/file/xafobakesefel.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nozibakufemetefal.pdf
    • http://boekenwinkelindex.nl/images/uploads/jipamivejowunutododiwu.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/53501223543.pdf
    • https://wagaskar.com/media/nubomin.pdf
    • http://simonide.org/userfiles/file/waralukuriduwe.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3b18991d34a224e8835ddbad3f5f62a5/vifunorozefope.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4adc88e7fabf9af0c0ab0c570d33bd54/jugukedaferituz.pdf
    • http://anandtouristcorporation.com/uploads/kanupasefakodomeneja.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/fvaa3cjiu2roh1fvsv289g6rlq/19685227230.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba180513026---suliwilagu.pdf
    • http://senseoftourism.dk/userfiles/file/13587038509.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f5fcac98---58710751091.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a109e321a06---68904948662.pdf
    • https://iwnta.com/userfiles/file/kubisewuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=oven+baked+sweet+potato+fries+calories
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16792 bytes
font_01_sfnt_off0001177b.bin
86c3af5b046fd4d4a40d47ca27ea7cb4b4692045d9646bf6a2d58c9ca58623e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 17428 bytes
font_02_sfnt_off00014571.bin
31c62c7a4d363daacb8503b698428ad0f09f17cc757acf70c6ba0aea63f30222
pdf-font-stream PDF embedded font (sfnt) at offset 0x14571 11024 bytes